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1. Not everyone loves to smooch. In fact, less than half of the world’s cultures (46 percent) enjoy locking lips for the sake of romance, according to a 2015 Indiana University study. Of the 146 cultures surveyed, Middle Easterners ranked as the most prevalent romantic kissers, followed by Asians at 73 percent, Europeans at 70 percent, and North Americans at 55 percent. In contrast, there is little evidence of romantic kissing in Central America, and some populations within Sub-Saharan Africa, New Guinea, and the Amazon. While the science is still out on why some societies simply don’t like to make out, researchers surmise that oral hygiene practices may play a role, since kissing can abet the spread of disease.
2. Turn right for romance. In the mood for love? Then you’re probably puckering up and turning your head right. Chastely pecking your son or daughter? You're likely pivoting left. These are the results of a 2016 study that investigated turning bias by surveying hundreds of photos of people kissing. Why couples veer right may be explained by the left brain’s reward center, since “couples associate kissing with feelings of reward, therefore right-turned kisses could be associated with the increased use of the brain’s left hemisphere.” (The left side of the brain controls the right side of the body, and vice versa).
3. Animals, they’re just like us. Specifically, chimpanzees and bonobos. For chimps, smooching is less about romance and more about reconciliation, part of a literal ‘kiss and make-up’ routine. Considerably less virtuous than their primate cousins, Bonobos kiss more frequently, even preferring the French variety, using their tongues (!) This isn’t too surprising; after all, bonobos greet each other by having sex. It’s their version of a handshake. Also worth noting, despite this behavior, these kisses still aren't considered romantic.
4. Men really are more likely to go in for the kiss. On-screen, it seems men are usually the ones to initiate lip-on-lip action, and in real life too. A 2017 university study surveyed 48 married couples in Bangladesh on their kissing behavior and found that men were 15 times more likely than their wives to initiate kisses.
5. A bad kiss can be a deal-breaker. Too much saliva? Too little tongue? A bad kiss, especially when it’s a couple’s first, can end the relationship, even before it starts, according to a 2009 University of Albany study. Based on a sample of a thousand college students, researchers found that women placed much importance on kiss quality and satisfaction, and wouldn’t engage in sexual encounters without it, whereas men didn’t make kissing a sex prerequisite nor did they mind having sex with bad kissers. And, in case you thought minds might have evolved since then: A 2016 e-Harmony study finds that 20 percent of Australians say they would break up with someone over their smooching ability (or lack thereof).
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